Furniture structure having a bamboo-like shape

ABSTRACT

A furniture structure having a bamboo-like shape primarily comprises a tensile-rod, a middle-die, an upper-die, a lower-die. A bamboo-like tube can be formed from a metal-tube, which is extruded and expanded at a suitable position via the separation and close-up of the upper-die and the lower-die. For constructing the furniture structure having a bamboo-like shape as a structure with bulged-flanges, as the hollow-hole of the metal tube is protruded by the middle-die, after upper-die and the lower-die are closed-up, the tensile-rod is moved toward the body of the middle-die along the prop-ups so that the metal-tube located at the molding portion is extruded and expanded by the first bulging-flange at the end of the prop-up, thus the finished metal-tube has a bulged-flange at intervals of a suitable distance.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a furniture structure having a bamboo-like shape, particularly to a furniture structure having a bamboo-like shape with bulged-flanges.

2. Description of the Prior Art

A conventional structure with a extruded bamboo-like shape, disclosed in patent announcement no. 267406 of R.O.C as a thereafter recited reference, has primary features of construction as following: two parallel rails installed on both sides on the top of a stand, a movement seat is installed on the rail, a lever is installed at the square end of the seat, a push seat is fixed on the top of the lever, and again a lower-die is installed on the movement seat, a guide-column is installed on both ends of the lower-die, a semi-circular molding groove is installed in the lower-die and an invaginated ring groove in the molding groove connected to an air port of the outside end of the lower-die, an matching upper-die is installed on the top of the lower-die, the upper-die is glide-sheathed on the guide-column and has a molding groove, a ring, an air port corresponding with the lower-die, and the top end of the upper-die is connected to the end of the push axis fixed on the push seat, a draw seat is installed on the bottom of the movement seat, and a end of the draw seat is connected to the push axis of a push cylinder, so that a slight bulged joint can be made from a tube material according with the molding speed of the movement seat. Such a construction has many faults, according to the recited reference, such as, too many components such as a lever, a push seat, a lower-die, an upper-die, and a draw seat, too complex operations for driving the draw seat and the movement seat, and easy damage.

Accordingly, it can be seen that the above-described conventional products still has many drawbacks, and are not designed well, and need to be improved urgently.

In view of disadvantages derived from the above-described conventional ways for extruding a bamboo-like structure, the present inventor had devoted to improve and innovate, and, after studying intensively for years, developed successfully a furniture structure having a bamboo-like shape according to the invention.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a furniture structure having a bamboo-like shape with bulged-flanges, which can be formed from a metal-tube.

The further object of the present invention is to provide a furniture structure, having a bamboo-like shape, after a metal-tube protrudes the prop-ups of the middle-die and places in the body of the middle-die, which can be rotated by manual operation, according with the requirement of a manufacturer, via the molding process of the bulged-flange structure of the present invention, and thus a bulged-flange structure with various features and pitches can be made by manual operation so that the overall structure of the furniture can more possess the bamboo feature.

The furniture structure having bamboo-like shape, capable of achieving the above-mentioned objects, comprises:

-   -   a metal-tube, a cylindrical object having a hollow-hole;     -   a tensile-rod having a guide-slant and an elongated bar;     -   a middle-die having a body and a plurality of prop-up, the body         having a hole in the middle, a first bulging-flange formed at         the end of the prop-up, a guide-rail formed between the         prop-ups; the tensile-rod protrudes the middle-die through the         hole;     -   an upper die and a lower die, symmetric each other, each having         a parting surface, a molding portion, and a contour-shape;     -   the hollow-hole of the metal-tube is protruded by the         middle-die, after upper-die and the lower-die put together, the         tensile-rod is moved to the body of the middle-die along the         prop-ups so that the metal-tube located at the molding portion         is extruded and expanded by the first bulging-flange at the end         of the prop-up to tightly close the first bulging-flange and the         molding portion of the upper-die and the lower-die, thus the         finished metal-tube has a bulged-flange at intervals of a         suitable distance and the metal-tube between two bulged-flanges         still can be maintained as an elongated tube.

These features and advantages of the present invention will be fully understood and appreciated from the following detailed description of the accompanying Drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings disclose an illustrative embodiment of the present invention which serves to exemplify the various advantages and objects hereof, and are as follows:

FIG. 1 is the stereo schematic view of a furniture structure having a bamboo-like shape according to the present invention;

FIG. 2 is the stereo break down schematic diagram of the upper/middle/lower dies of a furniture structure having a bamboo-like shape according to the present invention;

FIG. 3 is the schematic diagram of a bamboo-tube furniture structure according to the present invention, wherein the upper-die and the lower-die are separated; and

FIG. 4 is the schematic diagram of a bamboo-tube furniture structure according to the present invention, wherein the upper-die and the lower-die are closed-up.

REPRESENTATIVE SYMBOLS OF MAIN COMPONENTS

1 metal-tube 11 hollow-hole 12 bulged-flange 2 tensile-rod 21 guide-slant 22 elongated-bar 3 middle-die 31 body 32 prop-up 321 first bulging-flange 33 hole 34 guide-rail 4 upper-die 5 lower-die 41 molding-portion 42 contour-shape

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 2-4, the bamboo-tube furniture structure according to the present invention primarily comprises: a metal-tube 1, a cylindrical object having a hollow-hole 11; a tensile-rod 2 having a guide-slant 21 and an elongated bar 22; a middle-die 3 having a body 31 and a plurality of prop-up 32, the body 31 having a hole 33 in the middle, a first bulging-flange 321 formed at the end of the prop-up, a guide-rail 34 formed between the prop-ups 32; the tensile-rod 2 protrudes the middle-die 3 through the hole 33; an upper die 4 and a lower die 5, symmetric each other, each having a parting surface, a molding portion 41, and a contour-shape 42;

-   -   The hollow-hole 11 of the metal-tube 1 is protruded by the         middle-die 3, the upper-die 4 and the lower-die 5 can be         closed-up or separated; while the upper-die 4 and the lower-die         5 separated, the metal-tube 1 can be loaded on the contour-shape         42 of the upper-die 4 and the lower-die 5, and subsequently         while the upper-die 4 and the lower-die 5 closed-up, the         tensile-rod 2 is moved toward the body 31 of the middle-die 3         along the prop-ups 32 so that the metal-tube 1 located within         the molding-portion 41, extruded and expanded by the first         bulging-flange 321 at the end of the prop-up 32, causes the         bulged-flange 12 being fitted with the molding portion 41 of the         upper-die 4 and the lower-die 5; however, in the process of         molding for expansion, the required external force for molding         is provided from the end of the elongated bar 22 of the         tensile-rod 2, connected to an air-pressure, a piston, or a         punch (not shown), the prop-ups 32 of the middle-die 3 are         spread by the guide-slant 21 of the tensile-rod 2, thus can         force the first bulging-flange 321 closing to the metal-tube 1         and gradually draw the metal-tube 1 toward the molding portion         41 of the upper-die 4 and the lower-die 5.

The number of the prop-ups 32 can be adjusted according to the processing requirement. That is, 2 prop-ups 32, 3 prop-ups 32, or a plurality of prop-ups 32 can be applied to meet the processing requirement for spreading the prop-ups 32 of the middle-die 3 and to achieve the same tight-drawing effect.

After the metal-tube 1 is constructed by the above-mentioned components, the hollow-hole 11 of the metal-tube 1 is placed in the middle-die 3 of the present invention, then the upper-die 4 and the lower-die 5 is closed-up, then the tensile-rod 2 is moved to the body 31 of the middle-die 3 along the prop-ups 32, the prop-ups 32 of the fixed middle-die 3 is expanded outward further so that the metal-tube is expanded and molded as a bulged-flange 12 at a suitable position. Since the guide-slant 21 of the tensile-rod 2 and the molding portion 41 of the upper-die 4 and the lower-die 5 are collocated well, the prop-ups 32 of the middle-die 3 will not be damaged due to the first bulging-flange 321 is spread outward excessively. Furthermore, the space between the first bulging-flange 321 and the molding portion 41 of the upper-die 4 and the lower-die 5 can be adjusted according with the movement distance of the guide-slant 21 of the tensile-rod 2, such that the metal-tube 1 can be processed easily to form the buldged-flange 12.

More, for taking out the finished metal-tube 1, when the upper-die 4 and the lower-die 5 are separated, the metal-tube 1 is moved backward to release the spreading outward status of the prop-ups 32 of the middle-die 3, so that the metal-tube 1 can be taken from the upper-die 4 and the lower-die 5 easily. Thus, the finished metal-tube 1 has a bulged-flange 12 per a suitable distance and the metal-tube 1 between the bulged-flanges 12 still is an elongated tube.

Referring to FIG. 1, the metal-tube 1 of the present invention can be processed or bent as a seat frame, a backrest frame, a leg, and an armrest of a chair structure, or a seat for supporting a human body during working or resting.

Many changes and modifications in the above described embodiment of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims. 

1. A furniture structure having a bamboo-like shape, comprising: a metal-tube, a cylindrical object having a hollow-hole; a tensile-rod having a guide-slant and an elongated bar; a middle-die having a body and a plurality of prop-ups, the body having a hole in the middle, a first bulging-flange formed at the end of the prop-up, a guide-rail formed between the prop-ups; the tensile-rod protrudes the middle-die through the hole; an upper die and a lower die, symmetric each other, each having a parting surface, a molding portion, and a contour-shape; the hollow-hole of the metal-tube is protruded by the middle-die, after upper-die and the lower-die put together, the tensile-rod is moved to the body of the middle-die along the prop-ups so that the metal-tube located at the molding portion is extruded and expanded by the first bulging-flange at the end of the prop-up to tightly close the first bulging-flange and the molding portion of the upper-die and the lower-die, thus the finished metal-tube has a bulged-flange at intervals of a suitable distance and the metal-tube between two bulged-flanges still can be maintained as an elongated tube.
 2. The furniture structure having a bamboo-like shape of claim 1, wherein the number of the prop-ups of the middle-die is 2 or more.
 3. The furniture structure having a bamboo-like shape of claim 1, wherein the material of the metal-tube is aluminum. 